CN215949913U

CN215949913U - Sealing structure of compressor and compressor

Info

Publication number: CN215949913U
Application number: CN202121619642.1U
Authority: CN
Inventors: 韩聪; 李思茹; 常云雪; 朱万朋; 俞国新
Original assignee: Qingdao Haier Smart Technology R&D Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Smart Technology R&D Co Ltd; Haier Smart Home Co Ltd
Priority date: 2021-07-16
Filing date: 2021-07-16
Publication date: 2022-03-04
Anticipated expiration: 2031-07-16

Abstract

The utility model discloses a sealing structure of a compressor and the compressor, and relates to the technical field of compressors. The compressor includes impeller and stationary part, is provided with the clearance between impeller and the stationary part, and the seal structure of this compressor sets up in the clearance, is provided with direct current air flue and gyration air flue in the clearance, and the gas that gets into in the clearance can be shunted to direct current air flue and gyration air flue, and the gyration air flue can change the gaseous flow direction of the part gas that gets into it to prevent the gas of circulation in direct current air flue. According to the sealing structure of the compressor, the direct-flow air passage and the rotary air passage are arranged in the gap between the impeller and the static part, the gas entering the gap is divided into the direct-flow air passage and the rotary air passage, and the rotary air passage can change the flow direction of the gas entering the rotary air passage, so that the gas flowing out of the rotary air passage and the gas in the direct-flow air passage generate reverse conflict, the flow of leaked gas is prevented, the leakage amount of the gas is reduced, and dynamic sealing is realized.

Description

Sealing structure of compressor and compressor

Technical Field

The utility model relates to the technical field of compressors, in particular to a sealing structure of a compressor and the compressor.

Background

The magnetic suspension compressor becomes one of the mainstream directions of the development of the current centrifugal compressor due to the characteristics of high efficiency, energy conservation, no oil and the like. The magnetic suspension compressor has the advantages of high efficiency, no oil and the like because the moving part and the fixed part are not in direct contact and have no friction. Due to the characteristic that the moving part of the magnetic suspension compressor is not in contact with the fixed part, a certain gap exists between the impeller and the volute, and if the gap is too large, more leakage exists, and the efficiency is affected; if too small, rubbing can occur during the exercise.

All compressors have leakage during compression, which is a more or less problematic problem, the smaller the clearance, the less the leakage, and the clearance of the aerodynamic parts of the centrifugal compressor is certainly comparatively large. In order to realize the dynamic sealing of the gap, the existing common structure is that a grate structure is additionally arranged at the gap part, the circulation difficulty is increased, and a certain sealing effect is realized. However, as the moving part has certain offset in the operation process, the distance between the grate and the inner wall of the flow channel is always larger than the offset so as to ensure that the grate and the inner wall of the flow channel cannot collide with each other. The sealing capability of the sealing structure with the additional grate is limited, and the problem of gas leakage still exists.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to provide a sealing structure of a compressor, which can reduce gas leakage to a greater extent and has a better sealing effect.

Another object of the present invention is to provide a compressor having a small gas leakage amount and high energy efficiency.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a seal structure of compressor, the compressor includes impeller and stationary part, the impeller with be provided with the clearance between the stationary part, be provided with direct current air flue and gyration air flue in the clearance, the entering gas in the clearance can be shunted to direct current air flue with the gyration air flue, the gyration air flue can change the gaseous flow direction of the part gas that gets into it, in order to prevent the gaseous of circulation in the direct current air flue.

As a preferable configuration of the seal structure of the compressor, the rotary air path is provided on a stationary member near the gap. Because the impeller is rotating, the rotary air channel needs to be formed by a specific structure, and the processing is more convenient on a static part; and can guarantee the stability of gyration air flue, avoid the unstability that causes because of the impeller rotation.

As a preferable configuration of the sealing structure of the compressor, a plurality of the rotary air passages are provided at intervals on the stationary member in a flow direction of the direct-flow air passage. When gas leaked through a gap between the impeller and the stationary part passes through a branch port between the first rotary air passage and the direct-current air passage, part of the gas changes the gas flow direction through the first rotary air passage and then can be prevented from flowing in the direct-current air passage, and most of the gas is intercepted; the small part of the gas which is not intercepted continuously flows along the direct-current gas passage until the branch port of the second rotary gas passage and the direct-current gas passage, and the gas flow is changed through the second rotary gas passage to prevent the gas in the direct-current gas passage, so that the leaked gas is intercepted again; the gas flow is changed through the plurality of rotary gas passages, and then the leaked gas is subjected to closure for multiple times, so that the leaked gas is reduced to the minimum, and the sealing performance of the sealing structure of the compressor is improved.

As a preferable scheme of the sealing structure of the compressor, the stationary member includes a stationary member body and a water droplet type partition member, the stationary member body is provided with an arc-shaped groove, and the rotary air passage is formed between a contour line of the water droplet type partition member and the arc-shaped groove. In order to form the rotary air passage, the rotary air passage is arranged to be the same as the contour line of the water drop type separating piece, and the rotary air passage is formed between the contour line of the water drop type separating piece and the arc-shaped groove, so that the air entering the rotary air passage changes the air flow direction after flowing out along the contour line of the water drop type separating piece, can collide with the air in the direct-current air passage, and further intercept leaked air.

As a preferable scheme of the sealing structure of the compressor, a clamping groove is formed in the arc-shaped groove, a clamping block is arranged on the water-drop-shaped separator, and the clamping block is matched with the clamping groove so as to clamp and connect the water-drop-shaped separator and the static part body; or the like, or, alternatively,

threaded holes are formed in the arc-shaped grooves, through holes are formed in the water drop type separating pieces, and fastening bolts penetrate through the through holes and are in threaded connection with the threaded holes.

As a preferable mode of the sealing structure of the compressor, the water drop type partition includes a pointed end and a circular arc head, gas is branched from the pointed end to the direct flow gas passage and the rotary gas passage, and gas entering the rotary gas passage flows out from the circular arc head to the direct flow gas passage. The gas entering the gap is divided from the two sides of the tip of the water drop type separator, one part enters the rotary air passage, and the other part enters the direct-current air passage.

As a preferable aspect of the sealing structure of the compressor, an axis of the water droplet type partition is disposed at an angle to an outer wall of the impeller. In order to strengthen the effect of damming of the gas in the gyration air flue, set up water droplet type separator slope for the gaseous most entering gyration air flue in the entering clearance, and the gaseous gas that can intercept circulation in the direct current air flue when the gas that gets into the gyration air flue flows out from the gyration air flue, when gaseous flows out to the direct current air flue from the gyration air flue, the gas flow to be oblique ascending along the pitch arc of circular arc head, it is better to damming the effect.

As a preferable scheme of the sealing structure of the compressor, the included angle is 30 ° to 45 °. The included angle between the direction of the air flow and the outer wall of the impeller is 30 degrees when the air enters the direct-current air passage after rotating through the rotary air passage, the contact area between the air flowing out of the rotary air passage and the air in the direct-current air passage is larger, and the intercepting effect on the leaked air is better.

As a preferable aspect of the sealing structure of the compressor, the tip is located in the gap, and a distance from an end of the tip located in the axial gap to the impeller is larger than a distance that the impeller moves axially. The gas entering the gap is divided by the two sides of the tip, one part enters the rotary air passage, the other part enters the direct-current air passage, and the distance from the end part of the tip to the impeller is set to be larger than the axial movement distance of the impeller in order to avoid the interference between the tip of the water drop type separator and the impeller due to the fact that the impeller has certain displacement in the axial direction when rotating.

As a preferred scheme of the sealing structure of the compressor, the static part comprises a static part body and a semicircular separating part, an arc-shaped groove is formed in the static part body, and the contour line of the semicircular separating part and the static part body form the rotary air passage.

A compressor comprising an impeller, a stationary member and a compressor seal structure as claimed in any preceding claim, said compressor seal structure being provided in a radial gap and/or an axial gap between said impeller and said stationary member.

The utility model has the beneficial effects that:

according to the sealing structure of the compressor, the direct-flow air passage and the rotary air passage are arranged in the gap between the impeller and the static part, the gas entering the gap is divided into the direct-flow air passage and the rotary air passage, and the rotary air passage can change the flow direction of the gas entering the rotary air passage, so that the gas flowing out of the rotary air passage and the gas in the direct-flow air passage generate reverse conflict, the flow of leaked gas is prevented, the leakage amount of the gas is reduced, and dynamic sealing is realized.

According to the compressor provided by the utility model, by applying the sealing structure of the compressor, leakage is prevented by using the self force of leaked gas in the process that the impeller rotates relative to the static part, so that dynamic sealing is realized, the gas leakage amount is greatly reduced, and the energy efficiency of the compressor is improved.

Drawings

Fig. 1 is a schematic view of a sealing structure of a compressor according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a partially enlarged schematic view of a portion B in fig. 2.

In the figure:

1. an impeller; 2. a volute; 3. a worm disc; 4. a direct current air passage; 5. a revolving airway; 6. a water drop type separator;

11. an air inlet; 12. and an air outlet.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in direct contact with the second feature but being in contact with the second feature by another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical scheme of the utility model is further explained by the specific implementation mode in combination with the attached drawings.

Example one

The present embodiment provides a compressor including a motor, a pneumatic assembly, a bearing assembly, and a housing. The motor comprises a stator core, a coil and a rotor core, wherein the coil is wound on the stator core, the rotor core is fixedly arranged on the base through a bearing assembly, a silicon steel sheet and the coil are arranged on the rotor core, a magnetic field is generated on the silicon steel sheet on the stator core and the silicon steel sheet on the rotor core under the action of the coil, and the rotor core is driven to rotate by the magnetic field. The pneumatic assembly comprises an impeller, a turbine and a worm disc, the impeller is fixed on the rotor core and rotates along with the rotor core, the turbine and the worm disc are fixed on the shell and are in clearance fit with the impeller, the turbine and the worm disc do not rotate along with the impeller, and the turbine and the worm disc are named as static parts in a unified mode. When the compressor works, low-pressure gas is sucked into the air inlet of the impeller and works through high-speed rotation of the impeller, so that high-pressure gas is formed at the air outlet of the impeller, the high-pressure gas can return to the air inlet of the impeller through the gap between the impeller and the static part, gas leakage is caused, and the energy efficiency of the compressor is low.

As a preferable mode of the compressor, the sealing structure of the compressor is provided in a radial gap and/or an axial gap between the impeller and the stationary member. In this embodiment, the sealing structure of the compressor is arranged in the radial clearance between the impeller and the stationary part, and the sealing structure is arranged in the radial direction between the impeller and the stationary part, so that the axial length of the impeller does not need to be increased, and the influence of the increase of the axial length of the impeller on the operation stability is avoided.

Of course, in other embodiments, the sealing structure of the compressor may be disposed in the axial gap between the impeller and the stationary member; or, the sealing structure of the compressor is arranged in the axial clearance and the radial clearance between the impeller and the static part.

The compressor that this embodiment provided, at the rotatory in-process of impeller relative stationary part, utilize the strength of leaking gas self to prevent to leak, realized dynamic seal, reduced the gas leakage volume greatly, improved the efficiency of compressor.

Example two

As shown in fig. 1, the present embodiment provides a sealing structure of a compressor, which is applied to the compressor provided in the first embodiment, the compressor includes an impeller 1 and a stationary member, a gap is provided between the impeller 1 and the stationary member, a direct-flow gas passage 4 and a rotary gas passage 5 are provided in the gap, gas entering the gap can be divided into the direct-flow gas passage 4 and the rotary gas passage 5, and the rotary gas passage 5 can change a gas flow direction of a part of gas entering the rotary gas passage 5 to prevent gas flowing in the direct-flow gas passage 4.

The seal structure of compressor that this embodiment provided, through set up direct current air flue 4 and gyration air flue 5 in the clearance of impeller 1 and stationary part, the gas that gets into in the clearance is shunted to direct current air flue 4 and gyration air flue 5, gyration air flue 5 can change the flow direction of the gas that gets into in it, so that the gas that flows out from gyration air flue 5 takes place reverse conflict with the gas of direct current air flue 4 internal circulation, prevent the flow of gas that leaks, thereby reduce the leakage quantity of gas, realize dynamic seal.

As a preferable configuration of the sealing structure of the compressor, the rotary gas duct 5 is provided on the stationary member near the gap. Because the impeller 1 rotates, the rotary air channel 5 needs to be formed by a specific structure, and the processing is more convenient on a static part; and can guarantee the stability of gyration air flue 5, avoid because of the rotatory unstability that causes of impeller 1.

As a preferable configuration of the sealing structure of the compressor, a plurality of rotary gas passages 5 are provided at intervals on the stationary member along the flow direction of the direct-flow gas passage 4. When gas leaked through a gap between the impeller 1 and the stationary part passes through a branch port between the first rotary air passage and the direct-current air passage 4, part of the gas changes the gas flow direction through the first rotary air passage and then can be prevented from flowing into the direct-current air passage 4, and most of the gas is intercepted; the small part of the gas which is not intercepted continuously flows along the direct current gas passage 4 until the second rotary gas passage and the branch port of the direct current gas passage 4 are connected, the gas flow is changed backwards through the second rotary gas passage to stop the gas in the direct current gas passage 4, and the leaked gas is intercepted again; the above operation is repeated, the gas flow direction is changed through the plurality of rotary gas passages 5, and then the leaked gas is intercepted for a plurality of times, so that the leaked gas is reduced to the minimum, and the sealing performance of the sealing structure of the compressor is improved.

In the present embodiment, the number of the rotary air ducts 5 is not limited, and a person skilled in the art can set the number according to the length of the gap between the impeller 1 and the stationary member, and the larger the number of the rotary air ducts 5 is, the better the sealing effect is.

As shown in fig. 2 and 3, as a preferable configuration of the sealing structure of the compressor, the stationary member includes a stationary member body provided with an arc-shaped groove, and a water drop type partitioning member 6, and a revolving air duct 5 is formed between the outline of the water drop type partitioning member 6 and the arc-shaped groove. In order to form the rotary air passage 5, the rotary air passage 5 is set to be the same as the outline of the water drop type separator 6, and the rotary air passage 5 is formed between the outline of the water drop type separator 6 and the arc-shaped groove, so that the air entering the rotary air passage 5 changes the air flow direction after flowing out along the outline of the water drop type separator 6, can collide with the air in the direct-current air passage 4, and further intercept leaked air.

As the optimal scheme of the sealing structure of the compressor, a clamping groove is formed in the arc-shaped groove, a clamping block is arranged on the water drop type separating piece 6, and the clamping block is matched with the clamping groove to connect the water drop type separating piece 6 with the static piece body in a clamping mode. In the present embodiment, the water-drop type separator 6 is formed by assembling two structural members having a water-drop type cross section. Eight fixture blocks are arranged on the water drop type separator 6 at intervals, eight clamping grooves are arranged in the arc-shaped groove at intervals, the eight fixture blocks are connected with the eight clamping grooves in a one-to-one correspondence mode, the water drop type separator 6 is connected with the static part body in a clamping mode, and the rotary air channel 5 is formed.

In another alternative embodiment of the present invention, a threaded hole is formed in the arc-shaped groove, a through hole is formed in the drip spacer 6, and a fastening bolt is threaded through the through hole and the threaded hole to fixedly connect the drip spacer 6 and the stationary member body by the fastening bolt.

As a preferable scheme of the sealing structure of the compressor, the water drop type partition 6 includes a tip and a circular arc head, gas is branched from the tip to the direct flow gas passage 4 and the rotary gas passage 5, and gas entering the rotary gas passage 5 flows out from the circular arc head to the direct flow gas passage 4. In the present embodiment, the air flow entering the gap is branched from both sides of the tip of the water droplet type partition 6, and a part of the air flow enters the return air duct 5 and the other part of the air flow enters the direct flow air duct 4.

As a preferable configuration of the sealing structure of the compressor, the axis of the water droplet type partition 6 is disposed at an angle to the outer wall of the impeller 1. In this embodiment, for the gaseous effect of damming in reinforcing gyration gas flue 5, set up water droplet type separator 6 slope for the gaseous majority of entering in the clearance gets into gyration gas flue 5, and the gaseous gas that can intercept circulation in the direct current gas flue 4 when the gyration gas flue 5 of entering gyration gas flue 5 flows out, and when gaseous flows out to direct current gas flue 4 from gyration gas flue 5, the gas flow to be oblique ascending along the pitch arc of arc head, it is better to damming the effect.

As a preferable configuration of the sealing structure of the compressor, an angle between the axis of the water droplet type partition 6 and the outer wall of the impeller 1 is 30 ° to 45 °. In this embodiment, when gas enters the direct-current gas passage 4 after revolving through the revolving gas passage 5, the included angle between the direction of the gas flow and the outer wall of the impeller 1 is 30 degrees, the contact area between the gas flowing out of the revolving gas passage 5 and the gas in the direct-current gas passage 4 is larger, and the interception effect on the leaked gas is better.

As a preferable aspect of the sealing structure of the compressor, the tip is located in the gap, and the distance from the end of the tip located in the axial gap to the impeller 1 is greater than the distance that the impeller 1 moves axially. In the present embodiment, as shown in fig. 2, the water droplet type partition 6 is fixed to the stationary member of the radial gap, and the gas enters the impeller 1 from the gas inlet 11 in the axial direction of the impeller 1 and flows out from the gas outlet 12 in the radial direction of the impeller 1. As shown by the arrows in fig. 3, the leakage gas is easy to enter the radial gap from the first axial gap between the impeller 1 and the stationary member, and then returns to the inlet 11 through the second axial gap. In order to prevent leakage of the leakage gas from the gas inlet 11, the tip of the water droplet type partition 6 located at the junction of the first axial gap and the radial gap is located in the first axial gap and is more biased toward the radial gap, so that most of the gas leaking from the gas outlet 12 to the first axial gap enters the turning gas duct 5, and the interception effect on the small part of the gas in the straight gas duct 4 is better. But it is also ensured that the tip of the water droplet type partition member 6 does not interfere with the impeller 1 when the impeller 1 moves axially.

In another alternative embodiment of the present invention, the stationary member comprises a stationary member body on which an arc-shaped groove is provided, and a semicircular partition member whose arc-shaped contour line forms the revolving air passage 5 with the stationary member body. A clamping groove is formed in the arc-shaped groove, a clamping block is arranged on the semicircular separator, and the semicircular separator is fixedly connected with the stationary part body separator through the matching of the clamping block and the clamping groove.

Of course, the revolving duct 5 may be formed by the outline of the elliptical partitioning member and the stationary member body.

The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.

Claims

1. The utility model provides a seal structure of compressor, the compressor includes impeller (1) and stationary part, impeller (1) with be provided with the clearance between the stationary part, its characterized in that, be provided with direct current air flue (4) and gyration air flue (5) in the clearance, the entering gas in the clearance can be shunted to direct current air flue (4) with gyration air flue (5), gyration air flue (5) can change the gaseous flow direction of the part gas that gets into it, in order to prevent the gaseous of circulation in direct current air flue (4).

2. Sealing structure of compressor according to claim 1, characterized in that the rotary air duct (5) is provided on a stationary member near the gap.

3. The sealing structure of a compressor according to claim 2, wherein a plurality of the rotary air passages (5) are provided at intervals on the stationary member in a flow direction of the straight air passage (4).

4. The sealing structure of a compressor according to claim 1, wherein said stationary member includes a stationary member body provided with an arc-shaped groove and a water drop type partitioning member (6), and said rotary air duct (5) is formed between a contour line of said water drop type partitioning member (6) and said arc-shaped groove.

5. The sealing structure of the compressor according to claim 4, wherein a clamping groove is formed in the arc-shaped groove, and a clamping block is arranged on the water drop type separator (6) and is matched with the clamping groove so as to clamp and connect the water drop type separator (6) with the static part body; or the like, or, alternatively,

threaded holes are formed in the arc-shaped grooves, through holes are formed in the water drop type separating pieces (6), and fastening bolts penetrate through the through holes and are in threaded connection with the threaded holes.

6. The sealing structure of a compressor according to claim 4, wherein the water drop type partition (6) includes a tip from which gas is branched to the direct flow gas passage (4) and the rotary gas passage (5) and an arc from which gas entering the rotary gas passage (5) flows out to the direct flow gas passage (4).

7. The sealing structure of a compressor according to claim 6, wherein the axis of the water droplet type partition (6) is disposed at an angle to the outer wall of the impeller (1).

8. A sealing structure of a compressor according to claim 7, wherein said included angle is 30 ° to 45 °.

9. The sealing structure of a compressor according to claim 6, characterized in that the tip is located in the gap, and the distance from the end of the tip located in the axial gap to the impeller (1) is greater than the distance the impeller (1) moves axially.

10. The sealing structure of a compressor according to claim 1, wherein said stationary member includes a stationary member body and a semicircular partition member, said stationary member body being provided with an arc-shaped groove, and said rotary air passage (5) being formed between an outline of said semicircular partition member and said arc-shaped groove.

11. Compressor, characterized in that it comprises an impeller (1), a stationary part and a sealing structure of the compressor according to any one of claims 1 to 10, which is provided in the radial and/or axial clearance of the impeller (1) and the stationary part.